2005

6.3

2004

5.1

1999

3.4

1996

6.6

2002

7.1

1972

6.9

2005

5.5

2001

7.3

1997

6.8

2005

6.7

2005

6.8

2016

5.5

2014

6.3

2006

6.6

2008

5.8

1989

6.6

1995

6.6

1996

6.7

2006

6.0

2005

6.5